Flashcards in Homeostasis Deck (50):
Maintaining a constant internal environment
Main sense organs
Involuntary response to a stimuli
What happens across the synapse?
The electrical impulse from the presynaptic neurone causes the chemical messenger to fuse with the membrane diffusing the information across the synapse to the postsynaptic neurone in order for the movement to continue.
Time taken for a signal to be sent to the brain then to the relevant parts of the body to produce a response.
The outer layer of the brain. Responsible for more complex activities.
Long tube. Responsible for unconscious activities.
Lump behind the medulla. Responsible for balance and muscular activity.
In front of the medulla. The master gland responsible for all other hormones.
Possible ways of studying the brain
Observe a person with brain damage
Made up of cells which have a cell body, axons and dendrites. Sends messages received by light receptors, at the brain the messages become visual images, there is no retina here so there’s a blind spot but your brain fills the gap.
Transparent layer at the front of the eye. Lets light into the eye and refracts it a it enters so it is focused on the retina.
Held in place by ligaments and muscles. Main part of eye, fine tunes the light rays once they pass through the cornea.
Connect to the ciliary muscles to the lens and holds it in place. This stretches and slacks as the muscles contract and relax to adjust the thickness of the lens.
Control the size of the pupil. Made up of muscles. It is important as it prevents damage caused by too much light.
Change the shape of lens to increase or decrease refraction
White outer layer. Tough and strong protection.
Back of the eye with the light receptor cells. When the light hits then they are stimulated and send impulses along the sensory neurones of the optic nerves.
Process of changing the shape of the lens to focus on near or distant objects.
What happens when you look at something close up?
3.lens is thicker
4.light is refracted stronger
What happens when you look at something far away?
3.lens is thinner
4.less light is refracted
What happens to the eye when bright light is around?
Pupil constricts to prevent damage to the light receptors.
Proper name for short sightedness
Proper name for long sightedness
What is myopia solved with
What is hyperopia solved with
The process that allows your body to maintain its core internal temperature 37 degrees Celsius.
Your blood vessels get bigger to get rid of heat
Blood Vessels get smaller so that you lose less heat
A chemical messenger
They are secreted from glands and travel in the blood
Collection of glands that release hormones into blood
What does the pituitary gland do?
These hormones act on others glands to stimulate other hormones to be released to bring effects.
What does the pancreas do?
Responsible for controlling blood sugar levels. It produces and balances the concentration of insulin and glucagon.
Lowers blood sugar levels.
Increases blood sugar levels
Regular natural changes that occur in the uterus and ovaries that makes pregnancy possible.
FSH follicle stimulating hormone
Causes egg to mature.
LH luteinising hormone
Stimulated the release off the egg at ovulation
Stimulates build up of lining
Maintains the lining of the uterus
Oral contraceptive that inhibits FSH production
Injection or patch to slow release progesterone
Cap to place over cervix
Barrier methods like condoms
Intrauterine devices (inserted into uterus) to prevent implantation of embryo or release progesterone
Spermicidal agents to disable sperm
1.FSH and LH is injected into the mother to stimulate eggs maturing .
2. Remove an egg from the ovary
3. Fertilise egg and it forms an embryo
4. The embryos are inserted into the mothers uterus and the baby can develop
What are plant hormones called?
What do auxins do?
Cause tropisms which are growth responses to certain things
A response to light
A response to water
A response to gravity
How to auxins work?
When axons are disrupted evenly the plant goes straight up, when the sun fit example moved to the right the auxins move to the left causing more growth on the left causing the plant to tilt right towards the sun